Heart Rate Index calculator

Description

A heart rate-running speed index calculator over given (average) time span. The index reflexes the pace independent running performance; where a decrease means a performance increase. Optionally, the additional elevation effort can be include into the index equation to compensate for the pace reduction, or deduction when running downhill. </p><p></p><p>As already found by Conconi, there is a linear correlation of HR and running speed below aerobe - anaerobe threshold (https://de.wikipedia.org/wiki/Conconi-Test#/media/File:Conconi-Diagr.jpg). The calculate index is the linear factor of the linear curve HR vs pace. The index is an individual factor as standing HR and aerobe - anaerobe threshold are individual for each person. As along the standing HR is not changed, a lower index means improve performance; you can run at same pace, but with lower HR.</p>